Here are my submission statistics by month:
May: 3 submissions, 1 rejection (1 form)
June: 4 submissions, 3 rejections (2 form, 1 personal)
July: 4 submissions, 5 rejections (3 form, 2 personal)
August: 6 submissions, 3 rejections (1 form, 2 personal)
September: 5 submissions, 7 rejections (4 form, 3 personal)
October: 6 submissions, 4 rejections (3 form, 1 personal)
These numbers are difficult to understand. But I can say that none of the stories I submitted in May, June or July are stories I submitted in August, September, or October; I've retired my early stories and am now submitting only more recent ones.
Some markets habitually respond with a form letter, or respond with a personal note. So far I've only had one personal response from a market that is a habitual form responder (my one close call with publication). But the personal responses I've received recently have been of a higher quality, and have all included a note encouraging me to submit more. I call that progress!
One final note. I feel good about all the stories I currently have out. None of them are poorly written, all of them have interesting ideas, and at least a few of them have compelling stories with strong characters. I like my chances with them. And even if none of them get published, it only means I need to write more and better stories, which I believe I'm capable of. Onward!